A customer may want to change the date their next order falls on, they may wish to move up their order, or they may prefer being charged on Wednesday's, or the 5th of the month instead of the 10th. You can also adjust the day of the month their orders fall on, for scheduled billing.

For Example:

If you set up a re-billing date of the 15th of the month and decide you want to switch it to the 20th of the month, you can. Unfortunately, changing Subscription Group settings does not affect existing subscribers.

Fixed re-billing dates can be found in your Subscription Group settings when you choose a fixed shipping interval of every month

When you adjust a customer's next upcoming order, this will erase any changes they as a customer, or a shop admin may have made to their future orders.

It will wipe out their designated skipped orders, possibly resulting in the customer being charged for unwanted orders.

This includes future skipped orders, and possibly quantity exceptions or adjustments they may have made for a specific upcoming order.

When you adjust their upcoming order dates, this means you are adjusting their future order dates - meaning new orders are being made for those dates based off of their next order.

Under "Upcoming Orders" if a customer has skipped a future order, the word "Skipped" will show under "Status" in their subscription. This means they've chosen to skip a future order. Reach out to the customer before adjusting their upcoming order date, to make sure you skip any future orders they may need to have skipped.